Exhaust system components, removing and installing (All wheel drive vehicles): Notes

WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, and 2003 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Exhaust System Components, Removing And Installing (All Wheel Drive Vehicles)

Courtesy of VOLKSWAGEN UNITED STATES, INC.

1 - Turbocharger

Removing and installing → Turbocharger, removing and installing

2 - Gasket

Always replace

3 - Heated Oxygen Sensor (HO2S) G39 , 50 Nm

Black connector
Grease threads only with hot bolt paste G 052 112 A3; paste must not be allowed to come into contact with slits in sensor body
Checking: → 24 - MULTIPORT FUEL INJECTION (MFI)

4 - Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130 , 50 Nm

Brown connector
Grease threads only with hot bolt paste G 052 112 A3; paste must not be allowed to come into contact with slits in sensor body
Checking: → 24 - MULTIPORT FUEL INJECTION (MFI)

5 - Catalytic converter

Protect from impact damage
Removing and installing → Catalytic converter, removing and installing

6 - Gasket

Always replace

7 - 25 Nm

8 - Front exhaust pipe

With decoupling element
To avoid damage, do not bend decoupling element by more than 10 °

9 - Front clamp

Align exhaust system so it is free of stress before tightening clamp → Exhaust system - vehicles with all wheel drive, aligning stress-free
Installed position of bolt ends Installed position of front clamp
Tighten bolted connections evenly

10 - 40 Nm

11 - Spacer sleeve

12 - Buffer

13 - Lug

14 - Washer

15 - M10 bolt, 30 Nm

16 - Rear muffler (left)

Tailpipe can be replaced
Rear muffler and center muffler are one unit as original equipment but can be replaced separately for repair purposes.
Cutting point → Center and rear mufflers, separating
Stress-free alignment of exhaust system → Exhaust system - vehicles with all wheel drive, aligning stress-free

Replacing tailpipe Replacing tailpipe

17 - Mounting

18 - 25 Nm

19 - Rear muffler (right)

Tailpipe can be replaced
Rear muffler and center muffler are one unit as original equipment but can be replaced separately for repair purposes.
Cutting point → Center and rear mufflers, separating
Stress-free alignment of exhaust system → Exhaust system - vehicles with all wheel drive, aligning stress-free

Replacing tailpipe Replacing tailpipe

20 - 40 Nm

21 - Rear clamps

For separate replacement of center muffler and both rear mufflers
Align exhaust system so it is free of stress before tightening clamp → Exhaust system - vehicles with all wheel drive, aligning stress-free
Installed position Installed position of rear clamps
Tighten bolted connections evenly

22 - Center muffler

Center muffler and both rear mufflers are one unit as original equipment but can be replaced separately for repair purposes.
Cutting point → Center and rear mufflers, separating
Stress-free alignment of exhaust system → Exhaust system - vehicles with all wheel drive, aligning stress-free

23 - 25 Nm

24 - Mounting

25 - M8 bolt

26 - Washer

27 - Spring

28 - Lug

29 - Spacer sleeve

30 - 25 Nm

31 - 40 Nm